https://www.youtube.com/watch?v=0t2tjNqGyJI
Steam support is like : https://www.youtube.com/watch?v=NdxSwW9Zgog
This is legit.
steam://rungame/730/76561202255233023/+csgo_download_match%20CSGO-oQt7E-OhLbQ-JsC7S-R8YAK-O9tvE

steam://rungame/730/76561202255233023/+csgo_download_match%20CSGO-S74L5-5E4wL-AmuZL-P7Kz6-wyTaK

steam://rungame/730/76561202255233023/+csgo_download_match%20CSGO-bdTMG-bDKD7-KHDSo-NVF2U-uFqqK

steam://rungame/730/76561202255233023/+csgo_download_match%20CSGO-otnOW-qd22L-QDvrb-7pjT9-LdNEL

steam://rungame/730/76561202255233023/+csgo_download_match%20CSGO-tVCCh-CsCqT-NpBvM-reeo8-ZKV5F

steam://rungame/730/76561202255233023/+csgo_download_match%20CSGO-p2NiX-WK4yb-ULmYc-oj7Cs-qrzED

steam://rungame/730/76561202255233023/+csgo_download_match%20CSGO-NcFxe-RcxNx-XYis8-5St9Z-Y6TvD

steam://rungame/730/76561202255233023/+csgo_download_match%20CSGO-B2Cva-irVfb-Ff6FL-jzGS4-8AF4C